WO2024075156A1 - Retainer, roller bearing, and method for assembling rolling bearing - Google Patents

Retainer, roller bearing, and method for assembling rolling bearing Download PDF

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Publication number
WO2024075156A1
WO2024075156A1 PCT/JP2022/036956 JP2022036956W WO2024075156A1 WO 2024075156 A1 WO2024075156 A1 WO 2024075156A1 JP 2022036956 W JP2022036956 W JP 2022036956W WO 2024075156 A1 WO2024075156 A1 WO 2024075156A1
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WO
WIPO (PCT)
Prior art keywords
wall
cage
rollers
roller
retainer
Prior art date
Application number
PCT/JP2022/036956
Other languages
French (fr)
Japanese (ja)
Inventor
浩隆 安田
国男 樋口
泰正 百谷
Original Assignee
株式会社ジェイテクト
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社ジェイテクト filed Critical 株式会社ジェイテクト
Priority to PCT/JP2022/036956 priority Critical patent/WO2024075156A1/en
Priority to PCT/JP2022/045728 priority patent/WO2024075316A1/en
Publication of WO2024075156A1 publication Critical patent/WO2024075156A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles

Definitions

  • the present invention relates to a cage, a rolling bearing, and a method for assembling a rolling bearing.
  • the rolling bearing has an inner ring, an outer ring, multiple rolling elements, and a retainer that holds the multiple rolling elements.
  • the retainer has multiple pockets that accommodate the rolling elements.
  • the retainer disclosed in Patent Document 1 has a first annular body that faces a first end face of the roller, which is the rolling element, a second annular body that faces a second end face of the roller, and multiple pillars that connect the first annular body and the second annular body. The space between the pair of pillars between the first annular body and the second annular body becomes the pocket that houses the roller.
  • Figure 16 is a perspective view showing a part of a conventional cage.
  • Figure 17 is a view of a pocket of a conventional cage, viewed along the axial direction of the rollers.
  • the cage 90 has protrusions 92 as anti-fallout sections that prevent the rollers 99 housed in the pockets 91 from falling out.
  • Two protrusions 92 are located in one pocket 91.
  • the dimension B between the two protrusions 92 is smaller than the diameter D of the rollers 99. For this reason, when the rollers 99 are inserted into the pockets 91, the rollers 99 push the protrusions 92, causing the pillars 93 of the cage 90 to elastically deform. This causes stress concentration at the connection 95 between the pillars 93 and the annular body 94.
  • a recessed surface 96 is provided at the connection 95 between the pillar 93 and the annular body 94.
  • the recessed surface 96 is formed over the entire length of the retainer 90, from the outer peripheral surface 97 to the inner peripheral surface 98. Because the recessed surface 96 is formed over a wide area, the thickness of the connection 95 becomes small, and the strength of the retainer 90 may become insufficient.
  • the recessed surface 96 reduces the contact area between the rollers 99 and the annular body 94.
  • the rollers 99 have a recessed portion 100 on the radially inner side of the end face 99a for the purpose of their manufacture.
  • the end face 99a of the rollers 99 contacts the annular body 94, but if the recessed portion 100 is large and the recessed surface 96 is formed wide in the radial direction, the contact area between the rollers 99 and the annular body 94 is narrowed. For this reason, particularly when the retainer 90 is made of resin, part of the annular body 94 is likely to be worn away by contact with the end face 99a of the rollers 99.
  • the present disclosure makes it possible to reduce the stress concentration that occurs in the cage of a rolling bearing when the rollers are inserted into the pockets, thereby making it possible to reduce wear caused by contact with the rollers.
  • the cage according to the embodiment of the present invention is A cage having a first wall facing a first end surface of a roller of a rolling bearing, a second wall facing a second end surface of the roller, and a plurality of pillars connecting the first wall and the second wall, wherein a space between the pair of pillars between the first wall and the second wall forms a pocket for accommodating the roller, the pillar has a drop-out prevention portion on at least one of a first side and a second side in a radial direction to prevent the roller housed in the pocket from dropping out,
  • the connection portion between the first wall and the pillar has a first concave surface located on a first radial side and a second concave surface located on a second radial side, the first concave surface being recessed more than the second concave surface.
  • the cage of the present invention can reduce the stress concentration that occurs when the rollers are inserted into the cage pockets, making it possible to reduce wear on the cage due to contact with the rollers.
  • FIG. 1 is a cross-sectional view showing an embodiment of a rolling bearing according to the present invention.
  • FIG. 2 is a perspective view of the cage.
  • FIG. 3 is an explanatory diagram of a roller housed in a pocket as viewed along the central axis of the roller.
  • FIG. 4 is a diagram in which the rollers are removed from the explanatory diagram shown in FIG.
  • FIG. 5 is an enlarged view of a portion of the cage.
  • FIG. 6 is a cross-sectional view of a region of the first connection portion where the concave arc surface is formed, as viewed in the radial direction of the cage.
  • FIG. 1 is a cross-sectional view showing an embodiment of a rolling bearing according to the present invention.
  • FIG. 2 is a perspective view of the cage.
  • FIG. 3 is an explanatory diagram of a roller housed in a pocket as viewed along the central axis of the roller.
  • FIG. 4 is a diagram in which the rollers are removed
  • FIG. 7 is a cross-sectional view of a region of the first connection portion where a recessed surface is formed, as viewed in the radial direction of the cage.
  • FIG. 8 is a perspective view showing a modification of the cage shown in FIG.
  • FIG. 9 is a diagram for explaining the cage shown in FIG. 8, in which the pockets are viewed along the central axes of the rollers.
  • FIG. 10 is a cross-sectional view showing another embodiment of the rolling bearing.
  • FIG. 11 is a perspective view of a cage included in the rolling bearing shown in FIG.
  • FIG. 12 is a perspective view showing a modification of the cage shown in FIG.
  • FIG. 13 is a cross-sectional view showing another embodiment of the rolling bearing.
  • FIG. 14 is a front view showing a part of the rolling bearing shown in FIG.
  • FIG. 15 is a perspective view of a retainer segment.
  • FIG. 16 is a perspective view showing a part of a conventional cage.
  • FIG. 17 is a view showing
  • the cage according to the embodiment of the present invention is A cage having a first wall facing a first end surface of a roller of a rolling bearing, a second wall facing a second end surface of the roller, and a plurality of pillars connecting the first wall and the second wall, wherein a space between the pair of pillars between the first wall and the second wall forms a pocket for accommodating the roller, the pillar has a drop-out prevention portion on at least one of a first side and a second side in a radial direction to prevent the roller housed in the pocket from dropping out,
  • the connection portion between the first wall and the pillar has a first concave surface located on a first radial side and a second concave surface located on a second radial side, the first concave surface being recessed more than the second concave surface.
  • the first concave surface can alleviate stress concentration that occurs at the connection portion.
  • the first concave surface exists on the first radial side, and does not exist on the second radial side.
  • the contact area between the first end face of the roller and the first wall is ensured to be larger than when the first concave surface exists penetrating from the first radial side to the second radial side. Wear of the cage caused by the small contact area is suppressed.
  • the first concave surface has an inclined surface such that the gap formed between the first concave surface and the roller increases with increasing distance from the second concave surface in the radial direction.
  • the cage can enhance the function of ensuring a wide contact area without impairing the function of reducing the stress concentration.
  • the retainer is made of resin
  • the first wall has a connecting surface connecting the first concave surface on one of a pair of adjacent pillars to the first concave surface on the other of the pair of pillars
  • the connecting surface is a surface where the gap formed between the rollers gradually increases toward the first side in the radial direction.
  • the first wall is a first annular body having a circular ring shape
  • the second wall is a second annular body having a circular ring shape
  • the cage is annular and has a plurality of pockets, each of which accommodates a roller.
  • the retainer is composed of a plurality of retainer segments positioned in an annular space between an inner ring and an outer ring of a rolling bearing, and each of the retainer segments has the first wall, the second wall, and two of the pillars.
  • the cage is composed of a plurality of cage segments.
  • the rolling bearing according to the embodiment of the present invention is The bearing comprises an inner ring, an outer ring, a plurality of rollers positioned between the inner ring and the outer ring, and the cage that holds the rollers. With respect to the cage of the rolling bearing, stress concentration occurring when the rollers are fitted into the pockets is alleviated, and wear due to contact with the rollers can be suppressed.
  • a method for assembling the rolling bearing according to an embodiment of the present invention includes the steps of: an integration step of assembling the rollers into the pockets from at least one of a first side and a second side in a radial direction to obtain a unit of the cage and the rollers, In the integration process, the roller is inserted into the pocket while the roller presses the fall-off prevention portion and elastically deforms the pillar.
  • the above assembly method reduces stress concentration that occurs when the rollers are inserted into the pockets. Wear caused by contact with the rollers in the cage of the assembled rolling bearing is suppressed.
  • Fig. 1 is a cross-sectional view showing one embodiment of a rolling bearing of the present invention.
  • the rolling bearing 10 shown in Fig. 1 is a cylindrical roller bearing, and includes an inner ring 11, an outer ring 12, a plurality of rollers (cylindrical rollers) 13, and a cage 14 that holds the plurality of rollers 13.
  • the inner ring 11 and the outer ring 12 have an annular shape.
  • the rollers 13 are located between the inner ring 11 and the outer ring 12.
  • the central axis of the inner ring 11 and the central axis of the outer ring coincide with each other, and these central axes form a central axis C of the rolling bearing 10.
  • the retainer 14 shown in FIG. 1 is annular. For each embodiment of the present invention, a state in which the central axis of the retainer 14 coincides with the central axis C of the rolling bearing 10 will be described.
  • the direction parallel to the central axis C is defined as the "axial direction.”
  • the direction perpendicular to the central axis C is defined as the "radial direction.”
  • the direction along the circle centered on the central axis C is defined as the "circumferential direction.”
  • the inner ring 11 has an inner ring raceway surface 21 on its outer peripheral surface.
  • the outer ring 12 has an outer ring raceway surface 22 on its inner peripheral surface.
  • the outer ring 12 has flanges 23 on both axial sides of the outer ring raceway surface 22.
  • the rollers 13 are cylindrical and have a first end face 26, a second end face 27, and an outer peripheral surface 28. The rollers 13 are in rolling contact with the inner ring raceway surface 21 and the outer ring raceway surface 22.
  • the inner ring 11, the outer ring 12, and the rollers 13 are made of steel.
  • the cage 14 is made of resin.
  • FIG. 2 is a perspective view of the retainer 14.
  • the retainer 14 has a first annular body 31, a second annular body 32, and a number of pillars 33.
  • the first annular body 31 is annular and serves as a first wall facing the first end face 26 of the roller 13.
  • the second annular body 32 is annular and serves as a second wall facing the second end face 27 of the roller 13.
  • the pillars 33 connect the first annular body 31 and the second annular body 32.
  • the pillars 33 face the outer peripheral surface 28 of the roller 13.
  • the space between a pair of pillars 33 adjacent to each other in the circumferential direction between the first annular body 31 and the second annular body 32 serves as a pocket 29 that accommodates the roller 13.
  • the pillars 33 have an inner fall prevention portion 34 on the inner peripheral side of the retainer 14 that prevents the rollers 13 housed in the pockets 29 from falling out.
  • the fall prevention portion 34 is provided partially on the pillars 33 in the axial direction and is composed of a protrusion that protrudes from the pillars 33.
  • Figure 3 is an explanatory diagram of the rollers 13 housed in the pockets 29 as viewed along the central axis P of the rollers 13. When the rollers 13 housed in the pockets 29 are displaced radially inward of the retainer 14, they come into contact with the fall prevention portion 34, preventing the rollers 13 from falling out.
  • the pillars 33 have an outer anti-fallout portion 35 on the outer periphery of the cage 14, which prevents the rollers 13 housed in the pockets 29 from falling out.
  • the anti-fallout portion 35 is partially provided on the pillars 33 in the axial direction (see FIG. 2), and is composed of a protrusion protruding from the pillars 33.
  • the outer anti-fallout portion 35 may be omitted.
  • the rolling bearing 10 shown in FIG. 1 is assembled as follows. With the cage 14 positioned on the inner periphery of the outer ring 12, the rollers 13 are inserted into the pockets 29 of the cage 14. The rollers 13 are inserted into the pockets 29 from the inner periphery of the cage 14. As shown in FIG. 3, when focusing on one pocket 29, the dimension B between the two anti-dropout parts 34 is smaller than the diameter D of the rollers 13. Therefore, when the rollers 13 are inserted into the pockets 29, the rollers 13 press the anti-dropout parts 34, causing the pillars 33 to elastically deform.
  • the outer ring assembly is the assembly in which all the rollers 13 are inserted into the pockets 29 of the cage 14 positioned on the outer ring 12. The outer ring assembly is combined with the inner ring 11 to form the rolling bearing 10.
  • the portion where the first annular body 31 and one of the pillars 33 are connected is the first connection portion 41.
  • the portion where the second annular body 32 and one of the pillars 33 are connected is the second connection portion 42.
  • Fig. 4 is a diagram showing the rollers 13 removed from the explanatory diagram shown in Fig. 3.
  • Fig. 5 is an enlarged view of a portion of the cage 14.
  • the first connection portion 41 has a concave arc surface (second concave surface) 43 located on the outer periphery side and a recess surface (first concave surface) 44 located on the inner periphery side.
  • the concave arc surface 43 is a surface having a shape along a cylinder with a small radius.
  • the recess surface 44 is a surface that is more recessed than the concave arc surface 43.
  • the concave arc surface 43 and the recess surface 44 are also provided on the second connection portion 42.
  • the second connection portion 42 has a concave arc surface 43 located on the outer periphery side and a recess surface 44 located on the inner periphery side.
  • the concave arc surface 43 of the first connection portion 41 and the concave arc surface 43 of the second connection portion 42 have the same shape
  • the recess surface 44 of the first connection portion 41 and the recess surface 44 of the second connection portion 42 have the same shape.
  • the recessed surface 44 is a surface having a shape that follows a cone.
  • the recessed surface 44 has an inclined surface 45 that increases the recession as it moves away from the concave arc surface 43 in the radial direction, that is, toward the inner periphery.
  • the gap e1 formed between the recessed surface 44 and the end surface 26 (27) of the roller 13 (see FIG. 1) increases as it moves toward the inner periphery due to the inclined surface 45.
  • FIG. 6 is a cross-sectional view of the area of the first connection portion 41 where the concave arc surface 43 is formed, as viewed in the radial direction of the cage 14.
  • the pillar 33 has a side surface 33a that faces the outer peripheral surface 28 of the roller 13.
  • the first annular body 31 has a side surface 31a that faces the first end surface 26 of the roller 13.
  • the concave arc surface 43 is a surface at the intersection of the first annular body 31 and the pillar 33, and is a surface whose cross section has a concave arc shape when viewed in the radial direction (see FIG. 6). In the cross section shown in FIG.
  • the side surface 33a of the pillar 33 is aligned along a tangent at the first end 43a of the concave arc surface 43.
  • the side surface 31a of the first annular body 31 is aligned along a tangent at the second end 43b of the concave arc surface 43.
  • FIG. 7 is a cross-sectional view of the area of the first connection portion 41 where the recessed surface 44 is formed, as viewed in the radial direction of the cage 14.
  • the recessed surface 44 is a surface at the intersection of the first annular body 31 and the pillar 33, and has a cross-section that is a concave arc shape when viewed in the radial direction (see FIG. 7).
  • the side surface 33a of the pillar 33 is aligned along a tangent to the first end 44a of the recessed surface 44.
  • the side surface 31a of the first annular body 31 intersects with a tangent K to the second end 44b of the recessed surface 44.
  • the recessed surface 44 is recessed from the side surface 31b of the first annular body 31 so as to move away from the end face 26 of the roller 13.
  • FIG. 8 is a perspective view showing a modified example of the retainer 14 shown in FIG. 5.
  • FIG. 9 is a view for explaining the retainer 14 shown in FIG. 8, showing the pocket 29 as viewed along the central axis P of the roller 13.
  • the first connection portion 41 has a concave arc surface 43 located on the outer periphery and a recess surface 44 located on the inner periphery.
  • the recess surface 44 is a surface that is more recessed than the concave arc surface 43.
  • the concave arc surface 43 and the recess surface 44 are also provided in the second connection portion 42.
  • the first annular body 31 has a connecting surface 46.
  • the first annular body 31 has a connecting surface 46 that connects the recess surface 44 on one pillar 33 side and the recess surface 44 on the other pillar 33 side of a pair of pillars 33 adjacent in the circumferential direction.
  • the connecting surface 46 is a surface where the gap e2 formed between the roller 13 (first end surface 26) gradually increases toward the inner periphery.
  • the connecting surface 46 is a surface that is inclined from the side surface 31a of the first annular body 31.
  • the second annular body 32 may have a connecting surface 46 like the first annular body 31.
  • Fig. 10 is a cross-sectional view showing another embodiment of a rolling bearing.
  • the rolling bearing 10 shown in Fig. 10 is a tapered roller bearing, and rollers 13 provided between an inner ring 11 and an outer ring 12 are tapered rollers.
  • the same components as those in the rolling bearing 10 shown in Fig. 1 are given the same reference numerals, and description of the same components will be omitted.
  • FIG. 11 is a perspective view of the retainer 14 of the rolling bearing 10 shown in FIG. 10.
  • the retainer 14 has a large-diameter first annular body 31, a small-diameter second annular body 32, and a number of pillars 33.
  • the first annular body 31 is annular and serves as a first wall facing the first end face 26 of the roller 13.
  • the second annular body 32 is annular and serves as a second wall facing the second end face 27 of the roller 13.
  • the pillars 33 connect the first annular body 31 and the second annular body 32.
  • the pillars 33 face the outer peripheral surface 28 of the roller 13.
  • the space between a pair of pillars 33 adjacent to each other in the circumferential direction between the first annular body 31 and the second annular body 32 serves as a pocket 29 for accommodating the roller 13.
  • the pillars 33 have an inner drop prevention portion 34 on the inner circumferential side of the retainer 14 that prevents the rollers 13 housed in the pockets 29 from falling out.
  • the drop prevention portion 34 is provided partially on the pillars 33 in the axial direction and is composed of a protrusion that protrudes from the pillars 33. In the form shown in FIG. 11, the drop prevention portion 34 is provided at a position closer to the first annular body 31 than to the second annular body 32.
  • the method of assembling the rolling bearing 10 shown in FIG. 10 is as follows. With the retainer 14 positioned on the inner periphery of the outer ring 12, the rollers 13 are inserted into the pockets 29 of the retainer 14. The rollers 13 are inserted into the pockets 29 from the inner periphery of the retainer 14. As with the first embodiment (see FIG. 3), when focusing on one pocket 29, the dimension between the two anti-dropout portions 34 is smaller than the diameter of the rollers 13 at the positions where these anti-dropout portions 34 are formed. For this reason, when the rollers 13 are inserted into the pockets 29, the rollers 13 press the anti-dropout portions 34, causing the pillars 33 to elastically deform.
  • the outer ring assembly is the assembly in which all the rollers 13 are inserted into the pockets 29 of the retainer 14 positioned on the outer ring 12.
  • the outer ring assembly is combined with the inner ring 11 to form the rolling bearing 10.
  • the portion where the first annular body 31 and one of the pillars 33 are connected is the first connection portion 41.
  • the portion where the second annular body 32 and one of the pillars 33 are connected is the second connection portion 42.
  • one pocket portion 15 that constitutes one pocket 29 there are two first connection portions 41 and two second connection portions 42. This is also the same as the first embodiment (see FIG. 2).
  • the first connection portion 41 has a concave arc surface 43 located on the outer periphery side and a recessed surface 44 located on the inner periphery side.
  • the concave arc surface 43 is a surface having a shape along a cylinder with a small radius.
  • the recessed surface 44 is a surface that is more recessed than the concave arc surface 43. In the case of the form shown in FIG. 11, the concave arc surface 43 and the recessed surface 44 are not provided in the second connection portion 42, but may be provided in the second connection portion 42.
  • the recessed surface 44 is a surface having a shape that follows a cone.
  • the recessed surface 44 has an inclined surface 45 that increases the concavity as it moves away from the concave arc surface 43 in the radial direction, that is, toward the inner periphery.
  • the inclined surface 45 increases the gap e1 formed between the recessed surface 44 and the end face 26 of the roller 13 (see FIG. 10) toward the inner periphery.
  • the shapes of the concave arc surface 43 and the recessed surface 44 are the same as those of the first embodiment (FIGS. 6 and 7).
  • the retainer 14 shown in FIG. 12 differs from the retainer 14 shown in FIG. 11 in that the first annular body 31 has a connecting surface 46.
  • the first annular body 31 has a connecting surface 46 that connects the recess surface 44 on one pillar 33 side and the recess surface 44 on the other pillar 33 side of a pair of pillars 33 adjacent to each other in the circumferential direction.
  • the connecting surface 46 is a surface where the gap formed between the roller 13 (first end surface 26) gradually increases toward the inner circumferential side.
  • the connecting surface 46 is a surface that is inclined from the side surface 31a of the first annular body 31.
  • the connecting surface 46 has the same configuration as the connecting surface 46 of the retainer 14 shown in FIG. 8.
  • Fig. 13 is a cross-sectional view showing another embodiment of a rolling bearing.
  • the rolling bearing 10 shown in Fig. 13 is a tapered roller bearing, and the rollers 13 provided between the inner ring 11 and the outer ring 12 are tapered rollers.
  • the cage 14 of the rolling bearing 10 according to the third embodiment is composed of a plurality of cage segments 17, as shown in Fig. 14.
  • the plurality of cage segments 17 are located in the annular space S between the inner ring 11 and the outer ring 12.
  • One roller 13 is held in one cage segment 17.
  • Figure 15 is a perspective view of the retainer segment 17.
  • the retainer segment 17 has a first wall 51, a second wall 52, and two pillars 53.
  • the first wall 51 faces the first end face 26 of the roller 13 (see Figure 13).
  • the second wall 52 faces the second end face 27 of the roller 13.
  • the pillars 53 connect the first wall 51 and the second wall 52.
  • the pillars 53 face the outer peripheral surface 28 of the roller 13. The space between the first wall 51 and the second wall 52 and between the pair of pillars 53 becomes the pocket 29 that accommodates the roller 13.
  • the pillars 53 have outer drop-out prevention portions 35 on the outer circumferential side of the cage segment 17, which prevent the rollers 13 housed in the pockets 29 from falling out.
  • the drop-out prevention portions 35 are formed by protrusions that protrude from the pillars 53.
  • the pillars 53 have inner drop prevention portions 34 on the inner peripheral side of the cage segment 17, which prevent the rollers 13 housed in the pockets 29 from falling out.
  • the drop prevention portions 34 are formed by protrusions that protrude from the pillars 53. When the rollers 13 housed in the pockets 29 are displaced radially inward of the cage 14, they come into contact with the drop prevention portions 34, preventing the rollers 13 from falling out.
  • the rolling bearing 10 shown in FIG. 13 is assembled as follows.
  • the rollers 13 are fitted into the pockets 29 of the retainer segments 17.
  • the rollers 13 are fitted into the pockets 29 from the outer periphery of the retainer segment 17. Focusing on one retainer segment 17 (see FIG. 15), the dimension between the two outer anti-dropout portions 35 is smaller than the diameter of the rollers 13 at the positions where these anti-dropout portions 35 are formed. For this reason, when fitting the rollers 13 into the pockets 29, the rollers 13 press the outer anti-dropout portions 35, causing the pillars 53 to elastically deform.
  • all the rollers 13 are fitted into the retainer segment 17, it becomes a roller and retainer.
  • the roller and retainer are combined with the inner ring 11 and then with the outer ring 12, it becomes a rolling bearing 10.
  • the portion where the first wall 51 and one of the pillars 53 are connected is the first connection portion 41.
  • the portion where the second wall 52 and one of the pillars 53 are connected is the second connection portion 42.
  • the first connection portion 41 has a concave arc surface 43 located on the inner circumference side and a recessed surface 44 located on the outer circumference side.
  • the concave arc surface 43 is a surface having a shape along a cylinder with a small radius.
  • the recessed surface 44 is a surface that is more recessed than the concave arc surface 43.
  • the concave arc surface 43 and the recessed surface 44 are also provided on the second connection portion 42.
  • the second connection portion 42 has a concave arc surface 43 located on the inner circumference side and a recessed surface 44 located on the outer circumference side.
  • the concave arc surface 43 of the first connection portion 41 and the concave arc surface 43 of the second connection portion 42 have the same shape, and the recessed surface 44 of the first connection portion 41 and the recessed surface 44 of the second connection portion 42 have the same shape.
  • the recessed surface 44 is a surface shaped like a cone.
  • the recessed surface 44 has an inclined surface 45 that increases the recession as it moves away from the concave arc surface 43 in the radial direction, that is, toward the outer periphery.
  • the inclined surface 45 increases the gap formed between the recessed surface 44 and the end surface 26 (27) of the roller 13 (see FIG. 13) toward the outer periphery.
  • the shapes of the concave arc surface 43 and the recessed surface 44 are the same as those of the first embodiment (FIGS. 6 and 7).
  • the cage 14 of the rolling bearing 10 in each of the above embodiments has the first annular body 31 (first wall 51) facing the first end face 26 of the roller 13, the second annular body 32 (second wall 52) facing the second end face 27 of the roller 13, and a plurality of pillars 33 (pillars 53) connecting the first annular body 31 (first wall 51) and the second annular body 32 (second wall 52).
  • the space between the first annular body 31 (first wall 51) and the second annular body 32 (second wall 52) and between the pair of pillars 33 (pillars 53) forms the pocket 29 that accommodates the rollers 13.
  • the pillar 33 (pillar 53) has a fall-out prevention portion on a first radial side that prevents the roller 13 housed in the pocket 29 from falling out.
  • first radial side is the inner side of the retainer 14
  • second radial side is the outer side of the retainer 14.
  • first radial side is the outer circumferential side of the retainer 14 (retainer segment 17)
  • second radial side is the inner circumferential side of the retainer 14 (retainer segment 17).
  • the first connection portion 41 between the first annular body 31 (first wall 51) and the pillar 33 (pillar 53) has a concave arc surface 43 located on the second radial side and a recess surface 44 located on the first radial side.
  • the recess surface 44 is recessed more than the concave arc surface.
  • the pillars 33 are elastically deformed in order to fit the rollers 13 into the pockets 29. Even in this case, the retainer 14 can alleviate the stress concentration occurring in the first connection portions 41 by the recessed surfaces 44.
  • the recessed surface 44 is present on the first radial side but not on the second radial side. This ensures a larger contact area between the first end face 26 of the roller 13 and the first annular body 31 (first wall 51) than in the past. The reduction in the contact area reduces wear on the cage 14.
  • the recessed surface 44 is present on the first radial side but is not present on the second radial side, thereby preventing a decrease in the strength of the cage 14.
  • the recessed surface 44 increases the length of the elastically deformable portion of the pillar 33 (pillar 53 ), making it easier to fit the rollers 13 into the pockets 29 .
  • the second connection portion 42 between the second annular body 32 (second wall 52) and the pillar 33 (pillar 53) has a concave arc surface 43 located on the second radial side and a recessed surface 44 located on the first radial side, similar to the first connection portion 41.
  • the recessed surface 44 is more recessed than the concave arc surface 43. Therefore, the contact area between the second end surface 27 of the roller 13 and the second annular body 32 (second wall 52) is ensured to be larger than in the past.
  • the recess surface 44 has an inclined surface 45 that increases the gap between the roller 13 and the recessed surface 44 as it moves away from the concave arc surface 43 in the radial direction.
  • This inclined surface 45 ensures a wide contact area between the first end surface 26 of the roller 13 and the first annular body 31 (first wall 51) without impairing the stress concentration relief function.
  • the recessed surface (first concave surface) 44 connected to the concave arc surface (second concave surface) 43 has a shape along a cone.
  • the recessed surface 44 may have a shape other than that, and may have a surface shaped along a cylinder larger than the concave arc surface 43, although this is not shown.
  • the recessed surface 44 may be composed of a surface shaped along a cylinder larger than the concave arc surface 43 and a surface shaped along a cone.
  • the boundary between the concave arc surface 43 and the recessed surface 44 is located midway in the radial direction of the first connection portion 41 (second connection portion 42).
  • the concave arc surface 43 may be formed over a longer radial range than the recessed surface 44, or the recessed surface 44 may be formed over a longer radial range than the concave arc surface 43.
  • the contact area becomes larger.
  • the recessed surface 44 is formed over a longer range, the stress concentration relief function becomes higher.
  • the shape of the cage may vary depending on the type of rolling bearing, i.e., the rolling elements that the rolling bearing has.

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

This retainer 14 has: a first wall that faces a first end surface 26 of a roller 13 in a roller bearing 10; a second wall that faces a second end surface 27 of the roller 13; and a plurality of columns that join the first wall and the second wall. A space between the first wall and the second wall and between a pair of the columns, forms a pocket 29 that accommodates the roller 13. The columns each have a fall prevention section that prevents the fall of the roller 13 accommodated in the pocket 29, on at least one of a first side and a second side in the radial direction. A connecting section of the first wall and the column has a first recess surface 44 that is positioned on the first side in the radial direction, and a second recess surface 43 that is positioned on the second side in the radial direction, and the first recess surface 44 is recessed more than the second recess surface 43.

Description

保持器、転がり軸受、及び、転がり軸受の組み立て方法Cage, rolling bearing, and method of assembling rolling bearing
　本発明は、保持器、転がり軸受、及び、転がり軸受の組み立て方法に関する。 The present invention relates to a cage, a rolling bearing, and a method for assembling a rolling bearing.
　転がり軸受は、内輪、外輪、複数の転動体、及び、複数の転動体を保持する保持器を有する。保持器は、転動体を収容する複数のポケットを有する。特許文献１に開示の保持器は、転動体であるころの第一端面に対向する第一環状体と、ころの第二端面に対向する第二環状体と、第一環状体と第二環状体とを繋ぐ複数の柱とを有する。第一環状体と第二環状体との間であって一対の柱の間の空間が、ころを収容するポケットとなる。 The rolling bearing has an inner ring, an outer ring, multiple rolling elements, and a retainer that holds the multiple rolling elements. The retainer has multiple pockets that accommodate the rolling elements. The retainer disclosed in Patent Document 1 has a first annular body that faces a first end face of the roller, which is the rolling element, a second annular body that faces a second end face of the roller, and multiple pillars that connect the first annular body and the second annular body. The space between the pair of pillars between the first annular body and the second annular body becomes the pocket that houses the roller.
特開２０２１－１４３７６５号公報JP 2021-143765 A
　図１６は、従来の保持器の一部を示す斜視図である。図１７は、従来の保持器が有するポケットをころの軸線方向に沿って見た図である。保持器９０は、ポケット９１に収容するころ９９の脱落を防ぐ脱落防止部として突起９２を有する。一つのポケット９１に２つの突起９２が位置している。２つの突起９２間の寸法Ｂはころ９９の直径Ｄよりも小さい。このため、ポケット９１にころ９９を組み入れる際に、ころ９９が突起９２を押すことで、保持器９０の柱９３が弾性変形する。すると、柱９３と環状体９４との接続部９５に応力集中が生じる。 Figure 16 is a perspective view showing a part of a conventional cage. Figure 17 is a view of a pocket of a conventional cage, viewed along the axial direction of the rollers. The cage 90 has protrusions 92 as anti-fallout sections that prevent the rollers 99 housed in the pockets 91 from falling out. Two protrusions 92 are located in one pocket 91. The dimension B between the two protrusions 92 is smaller than the diameter D of the rollers 99. For this reason, when the rollers 99 are inserted into the pockets 91, the rollers 99 push the protrusions 92, causing the pillars 93 of the cage 90 to elastically deform. This causes stress concentration at the connection 95 between the pillars 93 and the annular body 94.
　前記応力集中の緩和のため、柱９３と環状体９４との接続部９５に、リセス面９６が設けられる。リセス面９６は、保持器９０の外周面９７から内周面９８までの全部にわたって形成されている。リセス面９６の形成範囲が広いことから、接続部９５の肉厚が小さくなり、保持器９０の強度が不足する場合がある。 To alleviate the stress concentration, a recessed surface 96 is provided at the connection 95 between the pillar 93 and the annular body 94. The recessed surface 96 is formed over the entire length of the retainer 90, from the outer peripheral surface 97 to the inner peripheral surface 98. Because the recessed surface 96 is formed over a wide area, the thickness of the connection 95 becomes small, and the strength of the retainer 90 may become insufficient.
　また、リセス面９６により、ころ９９と環状体９４との接触面積が狭くなる。ころ９９は、その製造のために、端面９９ａの径方向の内側にくぼみ部１００を有する。ころ９９の端面９９ａは環状体９４に接触するが、くぼみ部１００が大きく、さらに、リセス面９６が半径方向に広く形成されていると、ころ９９と環状体９４との接触面積が狭くなる。このため、保持器９０が特に樹脂製である場合、ころ９９の端面９９ａの接触によって環状体９４の一部が摩耗しやすい。 In addition, the recessed surface 96 reduces the contact area between the rollers 99 and the annular body 94. The rollers 99 have a recessed portion 100 on the radially inner side of the end face 99a for the purpose of their manufacture. The end face 99a of the rollers 99 contacts the annular body 94, but if the recessed portion 100 is large and the recessed surface 96 is formed wide in the radial direction, the contact area between the rollers 99 and the annular body 94 is narrowed. For this reason, particularly when the retainer 90 is made of resin, part of the annular body 94 is likely to be worn away by contact with the end face 99a of the rollers 99.
　そこで、本開示は、転がり軸受の保持器において、ころをポケットに組み入れる際に生じる応力集中の緩和が可能であり、ころとの接触による摩耗を抑えることを可能とする。 The present disclosure makes it possible to reduce the stress concentration that occurs in the cage of a rolling bearing when the rollers are inserted into the pockets, thereby making it possible to reduce wear caused by contact with the rollers.
　本発明の実施形態に係る保持器は、
　転がり軸受のころの第一端面に対向する第一壁と、前記ころの第二端面に対向する第二壁と、前記第一壁と前記第二壁とを繋ぐ複数の柱と、を有し、前記第一壁と前記第二壁との間であって一対の前記柱の間の空間が、前記ころを収容するポケットとなる保持器であって、
　前記柱は、半径方向の第一側及び第二側の少なくとも一方に、前記ポケットに収容する前記ころの脱落を防ぐ脱落防止部を有し、
　前記第一壁と前記柱との接続部は、半径方向の第一側に位置する第一凹面と、半径方向の第二側に位置する第二凹面と、を有し、前記第一凹面は、前記第二凹面よりも大きく凹んでいる。 The cage according to the embodiment of the present invention is
A cage having a first wall facing a first end surface of a roller of a rolling bearing, a second wall facing a second end surface of the roller, and a plurality of pillars connecting the first wall and the second wall, wherein a space between the pair of pillars between the first wall and the second wall forms a pocket for accommodating the roller,
the pillar has a drop-out prevention portion on at least one of a first side and a second side in a radial direction to prevent the roller housed in the pocket from dropping out,
The connection portion between the first wall and the pillar has a first concave surface located on a first radial side and a second concave surface located on a second radial side, the first concave surface being recessed more than the second concave surface.
　本発明の保持器は、保持器のポケットにころを組み入れる際に生じる応力集中を緩和することが可能であり、ころとの接触による保持器の摩耗を抑えることが可能となる。 The cage of the present invention can reduce the stress concentration that occurs when the rollers are inserted into the cage pockets, making it possible to reduce wear on the cage due to contact with the rollers.
図１は、本発明の転がり軸受の実施の一形態を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of a rolling bearing according to the present invention. 図２は、保持器の斜視図である。FIG. 2 is a perspective view of the cage. 図３は、ポケットに収容されたころを、そのころの中心軸に沿って見た場合の説明図である。FIG. 3 is an explanatory diagram of a roller housed in a pocket as viewed along the central axis of the roller. 図４は、図３に示す説明図から、ころを除いた図である。FIG. 4 is a diagram in which the rollers are removed from the explanatory diagram shown in FIG. 図５は、保持器の一部の拡大図である。FIG. 5 is an enlarged view of a portion of the cage. 図６は、第一接続部のうち、凹円弧面の形成領域を、保持器の半径方向に見た場合の断面図である。FIG. 6 is a cross-sectional view of a region of the first connection portion where the concave arc surface is formed, as viewed in the radial direction of the cage. 図７は、第一接続部のうち、リセス面の形成領域を、保持器の半径方向に見た場合の断面図である。FIG. 7 is a cross-sectional view of a region of the first connection portion where a recessed surface is formed, as viewed in the radial direction of the cage. 図８は、図５に示す保持器の変形例を示す斜視図である。FIG. 8 is a perspective view showing a modification of the cage shown in FIG. 図９は、図８に示す保持器を説明するための図であり、ポケットを、ころの中心軸に沿って見た場合の図である。FIG. 9 is a diagram for explaining the cage shown in FIG. 8, in which the pockets are viewed along the central axes of the rollers. 図１０は、転がり軸受の他の実施形態を示す断面図である。FIG. 10 is a cross-sectional view showing another embodiment of the rolling bearing. 図１１は、図１０に示す転がり軸受が有する保持器の斜視図である。FIG. 11 is a perspective view of a cage included in the rolling bearing shown in FIG. 図１２は、図１１に示す保持器の変形例を示す斜視図である。FIG. 12 is a perspective view showing a modification of the cage shown in FIG. 図１３は、転がり軸受の他の実施形態を示す断面図である。FIG. 13 is a cross-sectional view showing another embodiment of the rolling bearing. 図１４は、図１３に示す転がり軸受の一部を示す正面図である。FIG. 14 is a front view showing a part of the rolling bearing shown in FIG. 図１５は、保持器セグメントの斜視図である。FIG. 15 is a perspective view of a retainer segment. 図１６は、従来の保持器の一部を示す斜視図である。FIG. 16 is a perspective view showing a part of a conventional cage. 図１７は、従来の保持器が有するポケットをころの軸線方向に沿って見た図である。FIG. 17 is a view showing pockets of a conventional cage as viewed along the axial direction of the rollers.
＜本発明の実施形態の概要＞
　以下、本発明の実施形態の概要を列記して説明する。
　（１）本発明の実施形態に係る保持器は、
　転がり軸受のころの第一端面に対向する第一壁と、前記ころの第二端面に対向する第二壁と、前記第一壁と前記第二壁とを繋ぐ複数の柱と、を有し、前記第一壁と前記第二壁との間であって一対の前記柱の間の空間が、前記ころを収容するポケットとなる保持器であって、
　前記柱は、半径方向の第一側及び第二側の少なくとも一方に、前記ポケットに収容する前記ころの脱落を防ぐ脱落防止部を有し、
　前記第一壁と前記柱との接続部は、半径方向の第一側に位置する第一凹面と、半径方向の第二側に位置する第二凹面と、を有し、前記第一凹面は、前記第二凹面よりも大きく凹んでいる。 Overview of the embodiment of the present invention
Hereinafter, an outline of an embodiment of the present invention will be described.
(1) The cage according to the embodiment of the present invention is
A cage having a first wall facing a first end surface of a roller of a rolling bearing, a second wall facing a second end surface of the roller, and a plurality of pillars connecting the first wall and the second wall, wherein a space between the pair of pillars between the first wall and the second wall forms a pocket for accommodating the roller,
the pillar has a drop-out prevention portion on at least one of a first side and a second side in a radial direction to prevent the roller housed in the pocket from dropping out,
The connection portion between the first wall and the pillar has a first concave surface located on a first radial side and a second concave surface located on a second radial side, the first concave surface being recessed more than the second concave surface.
　前記保持器によれば、ポケットにころを組み入れるために、ころが脱落防止部を押すことにより柱は、弾性変形する。この場合、第一凹面は、接続部に生じる応力集中を緩和することが可能となる。第一凹面は、半径方向の第一側に存在し、半径方向の第二側に存在しない。このため、ころの第一端面と第一壁との接触面積は、第一凹面が半径方向の第一側から第二側まで貫通して存在する場合よりも広く確保される。前記接触面積が小さいことによって生じる保持器の摩耗が抑えられる。 　With the cage, in order to fit the roller into the pocket, the roller presses against the anti-fall-out portion, causing the pillar to elastically deform. In this case, the first concave surface can alleviate stress concentration that occurs at the connection portion. The first concave surface exists on the first radial side, and does not exist on the second radial side. As a result, the contact area between the first end face of the roller and the first wall is ensured to be larger than when the first concave surface exists penetrating from the first radial side to the second radial side. Wear of the cage caused by the small contact area is suppressed.
　（２）好ましくは、前記第一凹面は、前記第二凹面から半径方向に離れるにしたがって、前記ころとの間に形成される隙間が大きくなる傾斜面を有する。
　この場合の保持器は、前記応力集中の緩和機能を損なうことなく、前記接触面積を広く確保する機能を高めることが可能となる。 (2) Preferably, the first concave surface has an inclined surface such that the gap formed between the first concave surface and the roller increases with increasing distance from the second concave surface in the radial direction.
In this case, the cage can enhance the function of ensuring a wide contact area without impairing the function of reducing the stress concentration.
　（３）好ましくは、樹脂製の保持器であって、前記第一壁は、隣り合う一対の前記柱のうち、一方の前記柱側の前記第一凹面と、他方の前記柱側の前記第一凹面とを繋ぐ連結面を有し、前記連結面は、半径方向の第一側に向かって前記ころとの間に形成される隙間が徐々に大きくなる面である。
　この場合、保持器を金型により成形する場合、金型を半径方向の第一側へ抜きやすくなる。 (3) Preferably, the retainer is made of resin, and the first wall has a connecting surface connecting the first concave surface on one of a pair of adjacent pillars to the first concave surface on the other of the pair of pillars, and the connecting surface is a surface where the gap formed between the rollers gradually increases toward the first side in the radial direction.
In this case, when the cage is molded using a die, the die can be easily removed toward the first side in the radial direction.
　（４）好ましくは、前記第一壁は、円環状である第一環状体であり、前記第二壁は、円環状である第二環状体である。
　この場合の保持器は、環状である保持器が複数のポケットを有し、各ポケットにころが収容される。 (4) Preferably, the first wall is a first annular body having a circular ring shape, and the second wall is a second annular body having a circular ring shape.
In this case, the cage is annular and has a plurality of pockets, each of which accommodates a roller.
　（５）好ましくは、転がり軸受が有する内輪と外輪との間の環状空間に位置する複数の保持器セグメントにより構成される保持器であって、前記保持器セグメントそれぞれが、前記第一壁と、前記第二壁と、２つの前記柱と、を有する。
　この場合の保持器は、複数の保持器セグメントにより構成される。 (5) Preferably, the retainer is composed of a plurality of retainer segments positioned in an annular space between an inner ring and an outer ring of a rolling bearing, and each of the retainer segments has the first wall, the second wall, and two of the pillars.
In this case, the cage is composed of a plurality of cage segments.
　（６）本発明の実施形態に係る転がり軸受は、
　内輪と、外輪と、前記内輪と前記外輪との間に位置する複数のころと、前記ころを保持する前記保持器と、を備える。
　前記転がり軸受が有する保持器に関して、ころをポケットに組み入れる際に生じる応力集中が緩和され、ころとの接触による摩耗を抑えることが可能となる。 (6) The rolling bearing according to the embodiment of the present invention is
The bearing comprises an inner ring, an outer ring, a plurality of rollers positioned between the inner ring and the outer ring, and the cage that holds the rollers.
With respect to the cage of the rolling bearing, stress concentration occurring when the rollers are fitted into the pockets is alleviated, and wear due to contact with the rollers can be suppressed.
　（７）本発明の実施形態に係る前記転がり軸受の組み立て方法は、
　前記ポケットに対して前記ころを半径方向の第一側及び第二側の少なくとも一方から組み入れて前記保持器と前記ころとのユニットを得る一体化工程を有し、
　前記一体化工程で、前記ころが前記脱落防止部を押して前記柱を弾性変形させながら、前記ころが前記ポケットに組み入れられる。 (7) A method for assembling the rolling bearing according to an embodiment of the present invention includes the steps of:
an integration step of assembling the rollers into the pockets from at least one of a first side and a second side in a radial direction to obtain a unit of the cage and the rollers,
In the integration process, the roller is inserted into the pocket while the roller presses the fall-off prevention portion and elastically deforms the pillar.
　前記組み立て方法によれば、ころをポケットに組み入れる際に生じる応力集中は、緩和される。組み立てられた転がり軸受の保持器において、ころとの接触による摩耗は、抑えられる。 The above assembly method reduces stress concentration that occurs when the rollers are inserted into the pockets. Wear caused by contact with the rollers in the cage of the assembled rolling bearing is suppressed.
＜本発明の実施形態の詳細＞
　以下、本発明の実施形態を説明する。
〔転がり軸受の第一の形態〕
　図１は、本発明の転がり軸受の実施の一形態を示す断面図である。図１に示す転がり軸受１０は、円筒ころ軸受であり、内輪１１と、外輪１２と、複数のころ（円筒ころ）１３と、複数のころ１３を保持する保持器１４とを備える。内輪１１及び外輪１２は円環形状を有する。ころ１３は、内輪１１と外輪１２との間に位置する。内輪１１の中心軸と外輪の中心軸とは一致しており、これら中心軸が転がり軸受１０の中心軸Ｃとなる。 <Details of the embodiment of the present invention>
Hereinafter, an embodiment of the present invention will be described.
[First embodiment of rolling bearing]
Fig. 1 is a cross-sectional view showing one embodiment of a rolling bearing of the present invention. The rolling bearing 10 shown in Fig. 1 is a cylindrical roller bearing, and includes an inner ring 11, an outer ring 12, a plurality of rollers (cylindrical rollers) 13, and a cage 14 that holds the plurality of rollers 13. The inner ring 11 and the outer ring 12 have an annular shape. The rollers 13 are located between the inner ring 11 and the outer ring 12. The central axis of the inner ring 11 and the central axis of the outer ring coincide with each other, and these central axes form a central axis C of the rolling bearing 10.
　図１に示す保持器１４は環状である。本発明の各実施形態に関して、保持器１４の中心軸が転がり軸受１０の中心軸Ｃと一致する状態を説明する。内輪１１、外輪１２及び保持器１４に関して、中心軸Ｃに平行な方向が「軸方向」と定義される。中心軸Ｃに直交する方向が「半径方向」と定義される。中心軸Ｃを中心とする円に沿う方向が「周方向」と定義される。 The retainer 14 shown in FIG. 1 is annular. For each embodiment of the present invention, a state in which the central axis of the retainer 14 coincides with the central axis C of the rolling bearing 10 will be described. For the inner ring 11, outer ring 12, and retainer 14, the direction parallel to the central axis C is defined as the "axial direction." The direction perpendicular to the central axis C is defined as the "radial direction." The direction along the circle centered on the central axis C is defined as the "circumferential direction."
　内輪１１は、その外周面に、内輪軌道面２１を有する。外輪１２は、その内周面に、外輪軌道面２２を有する。外輪１２は、外輪軌道面２２の軸方向の両側に、つば２３を有する。ころ１３は、円柱形状であり、第一端面２６と、第二端面２７と、外周面２８とを有する。ころ１３は、内輪軌道面２１及び外輪軌道面２２に転がり接触する。内輪１１、外輪１２及びころ１３は鋼製である。保持器１４は樹脂製である。 The inner ring 11 has an inner ring raceway surface 21 on its outer peripheral surface. The outer ring 12 has an outer ring raceway surface 22 on its inner peripheral surface. The outer ring 12 has flanges 23 on both axial sides of the outer ring raceway surface 22. The rollers 13 are cylindrical and have a first end face 26, a second end face 27, and an outer peripheral surface 28. The rollers 13 are in rolling contact with the inner ring raceway surface 21 and the outer ring raceway surface 22. The inner ring 11, the outer ring 12, and the rollers 13 are made of steel. The cage 14 is made of resin.
　図２は、保持器１４の斜視図である。保持器１４は、第一環状体３１と、第二環状体３２と、複数の柱３３とを有する。第一環状体３１は、円環状であり、ころ１３の第一端面２６に対向する第一壁となる。第二環状体３２は、円環状であり、ころ１３の第二端面２７に対向する第二壁となる。柱３３は、第一環状体３１と第二環状体３２とを繋ぐ。柱３３は、ころ１３の外周面２８に対向する。第一環状体３１と第二環状体３２との間であって周方向で隣り合う一対の柱３３の間の空間が、ころ１３を収容するポケット２９となる。 FIG. 2 is a perspective view of the retainer 14. The retainer 14 has a first annular body 31, a second annular body 32, and a number of pillars 33. The first annular body 31 is annular and serves as a first wall facing the first end face 26 of the roller 13. The second annular body 32 is annular and serves as a second wall facing the second end face 27 of the roller 13. The pillars 33 connect the first annular body 31 and the second annular body 32. The pillars 33 face the outer peripheral surface 28 of the roller 13. The space between a pair of pillars 33 adjacent to each other in the circumferential direction between the first annular body 31 and the second annular body 32 serves as a pocket 29 that accommodates the roller 13.
　柱３３は、保持器１４の内周側に、ポケット２９に収容するころ１３の脱落を防ぐ内側の脱落防止部３４を有する。脱落防止部３４は、柱３３に軸方向について部分的に設けられていて、柱３３から突出する突起により構成されている。図３は、ポケット２９に収容されたころ１３を、そのころ１３の中心軸Ｐに沿って見た場合の説明図である。ポケット２９に収容されたころ１３は、保持器１４の半径方向の内側に変位すると、脱落防止部３４に接触し、ころ１３の脱落が防止される。 The pillars 33 have an inner fall prevention portion 34 on the inner peripheral side of the retainer 14 that prevents the rollers 13 housed in the pockets 29 from falling out. The fall prevention portion 34 is provided partially on the pillars 33 in the axial direction and is composed of a protrusion that protrudes from the pillars 33. Figure 3 is an explanatory diagram of the rollers 13 housed in the pockets 29 as viewed along the central axis P of the rollers 13. When the rollers 13 housed in the pockets 29 are displaced radially inward of the retainer 14, they come into contact with the fall prevention portion 34, preventing the rollers 13 from falling out.
　柱３３は、保持器１４の外周側に、ポケット２９に収容するころ１３の脱落を防ぐ外側の脱落防止部３５を有する。脱落防止部３５は、柱３３に軸方向について部分的に設けられていて（図２参照）、柱３３から突出する突起により構成されている。なお、外側の脱落防止部３５は省略されていてもよい。 The pillars 33 have an outer anti-fallout portion 35 on the outer periphery of the cage 14, which prevents the rollers 13 housed in the pockets 29 from falling out. The anti-fallout portion 35 is partially provided on the pillars 33 in the axial direction (see FIG. 2), and is composed of a protrusion protruding from the pillars 33. The outer anti-fallout portion 35 may be omitted.
　図１に示す転がり軸受１０の組み立て方法は次のとおりである。外輪１２の内周側に保持器１４を位置させた状態で、ころ１３は、その保持器１４のポケット２９に組み入れられる。ころ１３は、保持器１４の内周側からポケット２９に組み入れられる。図３に示すように、一つのポケット２９に着目した場合、２つの脱落防止部３４の間の寸法Ｂは、ころ１３の直径Ｄよりも小さい。このため、ポケット２９にころ１３を組み入れる際に、ころ１３が脱落防止部３４を押すことによって、柱３３は、弾性変形する。全てのころ１３を、外輪１２に位置させた保持器１４のポケット２９に組み入れたものが外輪アセンブリである。外輪アセンブリに、内輪１１を組み合わせたものが転がり軸受１０である。 The rolling bearing 10 shown in FIG. 1 is assembled as follows. With the cage 14 positioned on the inner periphery of the outer ring 12, the rollers 13 are inserted into the pockets 29 of the cage 14. The rollers 13 are inserted into the pockets 29 from the inner periphery of the cage 14. As shown in FIG. 3, when focusing on one pocket 29, the dimension B between the two anti-dropout parts 34 is smaller than the diameter D of the rollers 13. Therefore, when the rollers 13 are inserted into the pockets 29, the rollers 13 press the anti-dropout parts 34, causing the pillars 33 to elastically deform. The outer ring assembly is the assembly in which all the rollers 13 are inserted into the pockets 29 of the cage 14 positioned on the outer ring 12. The outer ring assembly is combined with the inner ring 11 to form the rolling bearing 10.
　図２において、第一環状体３１と一つの柱３３とが接続される部分が第一接続部４１である。第二環状体３２と一つの柱３３とが接続される部分が第二接続部４２である。一つのポケット２９を構成する単位ポケット部１５に着目した場合、二つの柱３３が、そのポケット２９に収容する一つのころ１３を保持器１４の周方向に挟む。このため、第一接続部４１は一つのポケット部１５に二つ存在し、第二接続部４２は一つのポケット部１５に二つ存在する。 In FIG. 2, the portion where the first annular body 31 and one of the pillars 33 are connected is the first connection portion 41. The portion where the second annular body 32 and one of the pillars 33 are connected is the second connection portion 42. When focusing on a unit pocket portion 15 that constitutes one pocket 29, two pillars 33 sandwich one roller 13 housed in that pocket 29 in the circumferential direction of the cage 14. For this reason, one pocket portion 15 has two first connection portions 41, and one pocket portion 15 has two second connection portions 42.
　図４は、図３に示す説明図から、ころ１３を除いた図である。図５は、保持器１４の一部の拡大図である。
　第一接続部４１は、外周側に位置する凹円弧面（第二凹面）４３と、内周側に位置するリセス面（第一凹面）４４とを有する。凹円弧面４３は、微小半径の円柱に沿った形状を有する面である。リセス面４４は、凹円弧面４３よりも大きく凹んでいる面である。凹円弧面４３及びリセス面４４は、第二接続部４２にも設けられている。つまり、第二接続部４２は、外周側に位置する凹円弧面４３と、内周側に位置するリセス面４４とを有する。本実施形態において、第一接続部４１の凹円弧面４３と第二接続部４２の凹円弧面４３とは同じ形状であり、第一接続部４１のリセス面４４と第二接続部４２のリセス面４４とは同じ形状である。 Fig. 4 is a diagram showing the rollers 13 removed from the explanatory diagram shown in Fig. 3. Fig. 5 is an enlarged view of a portion of the cage 14.
The first connection portion 41 has a concave arc surface (second concave surface) 43 located on the outer periphery side and a recess surface (first concave surface) 44 located on the inner periphery side. The concave arc surface 43 is a surface having a shape along a cylinder with a small radius. The recess surface 44 is a surface that is more recessed than the concave arc surface 43. The concave arc surface 43 and the recess surface 44 are also provided on the second connection portion 42. That is, the second connection portion 42 has a concave arc surface 43 located on the outer periphery side and a recess surface 44 located on the inner periphery side. In this embodiment, the concave arc surface 43 of the first connection portion 41 and the concave arc surface 43 of the second connection portion 42 have the same shape, and the recess surface 44 of the first connection portion 41 and the recess surface 44 of the second connection portion 42 have the same shape.
　リセス面４４は円すいに沿った形状を有する面である。リセス面４４は、凹円弧面４３から半径方向に離れるにしたがって、つまり、内周側に向かうにしたがって、凹みを大きくする傾斜面４５を有する。リセス面４４と、ころ１３（図１参照）の端面２６（２７）との間に形成される隙間ｅ１は、傾斜面４５により、内周側に向かうにしたがって、大きくなる。 The recessed surface 44 is a surface having a shape that follows a cone. The recessed surface 44 has an inclined surface 45 that increases the recession as it moves away from the concave arc surface 43 in the radial direction, that is, toward the inner periphery. The gap e1 formed between the recessed surface 44 and the end surface 26 (27) of the roller 13 (see FIG. 1) increases as it moves toward the inner periphery due to the inclined surface 45.
　図６は、第一接続部４１のうち、凹円弧面４３の形成領域を、保持器１４の半径方向に見た場合の断面図である。図４及び図６に示すように、柱３３は、ころ１３の外周面２８と対向する側面３３ａを有する。第一環状体３１は、ころ１３の第一端面２６と対向する側面３１ａを有する。凹円弧面４３は、第一環状体３１と柱３３とが交差する部分の面であり、半径方向に見た場合に（図６参照）断面が凹円弧形状となる面である。図６に示す断面において、柱３３の側面３３ａは、凹円弧面４３の第一の端４３ａにおける接線に沿う。第一環状体３１の側面３１ａは、凹円弧面４３の第二の端４３ｂにおける接線に沿う。 FIG. 6 is a cross-sectional view of the area of the first connection portion 41 where the concave arc surface 43 is formed, as viewed in the radial direction of the cage 14. As shown in FIGS. 4 and 6, the pillar 33 has a side surface 33a that faces the outer peripheral surface 28 of the roller 13. The first annular body 31 has a side surface 31a that faces the first end surface 26 of the roller 13. The concave arc surface 43 is a surface at the intersection of the first annular body 31 and the pillar 33, and is a surface whose cross section has a concave arc shape when viewed in the radial direction (see FIG. 6). In the cross section shown in FIG. 6, the side surface 33a of the pillar 33 is aligned along a tangent at the first end 43a of the concave arc surface 43. The side surface 31a of the first annular body 31 is aligned along a tangent at the second end 43b of the concave arc surface 43.
　図７は、第一接続部４１のうち、リセス面４４の形成領域を、保持器１４の半径方向に見た場合の断面図である。図４及び図７に示すように、リセス面４４は、第一環状体３１と柱３３とが交差する部分の面であり、半径方向に見た場合に（図７参照）断面が凹円弧形状となる面である。図７に示す断面において、柱３３の側面３３ａは、リセス面４４の第一の端４４ａにおける接線に沿う。第一環状体３１の側面３１ａは、リセス面４４の第二の端４４ｂにおける接線Ｋと交差する。リセス面４４は、ころ１３の端面２６から離れるように、第一環状体３１の側面３１ｂから凹んでいる。 FIG. 7 is a cross-sectional view of the area of the first connection portion 41 where the recessed surface 44 is formed, as viewed in the radial direction of the cage 14. As shown in FIGS. 4 and 7, the recessed surface 44 is a surface at the intersection of the first annular body 31 and the pillar 33, and has a cross-section that is a concave arc shape when viewed in the radial direction (see FIG. 7). In the cross-section shown in FIG. 7, the side surface 33a of the pillar 33 is aligned along a tangent to the first end 44a of the recessed surface 44. The side surface 31a of the first annular body 31 intersects with a tangent K to the second end 44b of the recessed surface 44. The recessed surface 44 is recessed from the side surface 31b of the first annular body 31 so as to move away from the end face 26 of the roller 13.
　図８は、図５に示す保持器１４の変形例を示す斜視図である。図９は、図８に示す保持器１４を説明するための図であり、ポケット２９を、ころ１３の中心軸Ｐに沿って見た場合の図である。図８及び図９に示す保持器１４と、図２から図５に示す保持器１４とで、同じ構成は同じ符号を付している。図８及び図９に示す保持器１４においても、図２から図５に示す保持器１４と同様に、第一接続部４１は、外周側に位置する凹円弧面４３と、内周側に位置するリセス面４４とを有する。リセス面４４は、凹円弧面４３よりも大きく凹んでいる面である。凹円弧面４３及びリセス面４４は、第二接続部４２にも設けられている。 FIG. 8 is a perspective view showing a modified example of the retainer 14 shown in FIG. 5. FIG. 9 is a view for explaining the retainer 14 shown in FIG. 8, showing the pocket 29 as viewed along the central axis P of the roller 13. The same components in the retainer 14 shown in FIGS. 8 and 9 and the retainer 14 shown in FIGS. 2 to 5 are given the same reference numerals. In the retainer 14 shown in FIGS. 8 and 9, as in the retainer 14 shown in FIGS. 2 to 5, the first connection portion 41 has a concave arc surface 43 located on the outer periphery and a recess surface 44 located on the inner periphery. The recess surface 44 is a surface that is more recessed than the concave arc surface 43. The concave arc surface 43 and the recess surface 44 are also provided in the second connection portion 42.
　図８及び図９に示す保持器１４は、第一環状体３１が連結面４６を有する点で、図２から図５に示す保持器１４と異なる。図８及び図９に示す保持器１４の場合、第一環状体３１は、周方向で隣り合う一対の柱３３のうち、一方の柱３３側のリセス面４４と他方の柱３３側のリセス面４４とを繋ぐ連結面４６を有する。連結面４６は、内周側に向かってころ１３（第一端面２６）との間に形成される隙間ｅ２が徐々に大きくなる面である。連結面４６は、第一環状体３１の側面３１ａから傾斜する面である。なお、第二環状体３２は、第一環状体３１と同様、連結面４６を有していてもよい。保持器１４を金型（射出成形金型）により成形する場合、その金型は、連結面４６により、半径方向へ抜きやすい。 8 and 9 differs from the cage 14 shown in FIGS. 2 to 5 in that the first annular body 31 has a connecting surface 46. In the case of the cage 14 shown in FIGS. 8 and 9, the first annular body 31 has a connecting surface 46 that connects the recess surface 44 on one pillar 33 side and the recess surface 44 on the other pillar 33 side of a pair of pillars 33 adjacent in the circumferential direction. The connecting surface 46 is a surface where the gap e2 formed between the roller 13 (first end surface 26) gradually increases toward the inner periphery. The connecting surface 46 is a surface that is inclined from the side surface 31a of the first annular body 31. The second annular body 32 may have a connecting surface 46 like the first annular body 31. When the cage 14 is molded using a mold (injection molding mold), the mold is easily removed in the radial direction due to the connecting surface 46.
〔転がり軸受の第二の形態〕
　図１０は、転がり軸受の他の実施形態を示す断面図である。図１０に示す転がり軸受１０は、円すいころ軸受であり、内輪１１と外輪１２との間に設けられるころ１３が、円すいころである。図１０に示す転がり軸受１０に関して、図１に示す転がり軸受１０と同じ構成は、同じ符号を付しており、同じ構成の説明を省略する。 [Second embodiment of rolling bearing]
Fig. 10 is a cross-sectional view showing another embodiment of a rolling bearing. The rolling bearing 10 shown in Fig. 10 is a tapered roller bearing, and rollers 13 provided between an inner ring 11 and an outer ring 12 are tapered rollers. In the rolling bearing 10 shown in Fig. 10, the same components as those in the rolling bearing 10 shown in Fig. 1 are given the same reference numerals, and description of the same components will be omitted.
　図１１は、図１０に示す転がり軸受１０が有する保持器１４の斜視図である。保持器１４は、大径の第一環状体３１と、小径の第二環状体３２と、複数の柱３３とを有する。第一環状体３１は、円環状であり、ころ１３の第一端面２６に対向する第一壁となる。第二環状体３２は、円環状であり、ころ１３の第二端面２７に対向する第二壁となる。柱３３は、第一環状体３１と第二環状体３２とを繋ぐ。柱３３は、ころ１３の外周面２８に対向する。第一環状体３１と第二環状体３２との間であって周方向で隣り合う一対の柱３３の間の空間が、ころ１３を収容するポケット２９となる。 FIG. 11 is a perspective view of the retainer 14 of the rolling bearing 10 shown in FIG. 10. The retainer 14 has a large-diameter first annular body 31, a small-diameter second annular body 32, and a number of pillars 33. The first annular body 31 is annular and serves as a first wall facing the first end face 26 of the roller 13. The second annular body 32 is annular and serves as a second wall facing the second end face 27 of the roller 13. The pillars 33 connect the first annular body 31 and the second annular body 32. The pillars 33 face the outer peripheral surface 28 of the roller 13. The space between a pair of pillars 33 adjacent to each other in the circumferential direction between the first annular body 31 and the second annular body 32 serves as a pocket 29 for accommodating the roller 13.
　柱３３は、保持器１４の内周側に、ポケット２９に収容するころ１３の脱落を防ぐ内側の脱落防止部３４を有する。脱落防止部３４は、柱３３に軸方向について部分的に設けられていて、柱３３から突出する突起により構成されている。図１１に示す形態において、脱落防止部３４は、第二環状体３２よりも第一環状体３１に近い位置に設けられている。ポケット２９に収容されたころ１３は、保持器１４の半径方向の内側に変位すると、脱落防止部３４に接触し、ころ１３の脱落が防止される。 The pillars 33 have an inner drop prevention portion 34 on the inner circumferential side of the retainer 14 that prevents the rollers 13 housed in the pockets 29 from falling out. The drop prevention portion 34 is provided partially on the pillars 33 in the axial direction and is composed of a protrusion that protrudes from the pillars 33. In the form shown in FIG. 11, the drop prevention portion 34 is provided at a position closer to the first annular body 31 than to the second annular body 32. When the rollers 13 housed in the pockets 29 are displaced radially inward of the retainer 14, they come into contact with the drop prevention portion 34, preventing the rollers 13 from falling out.
　図１０に示す転がり軸受１０の組み立て方法は次のとおりである。外輪１２の内周側に保持器１４を位置させた状態で、ころ１３は、その保持器１４のポケット２９に組み入れられる。ころ１３は、保持器１４の内周側からポケット２９に組み入れられる。前記第一の形態（図３参照）と同様、一つのポケット２９に着目した場合、２つの脱落防止部３４の間の寸法は、これら脱落防止部３４の形成位置におけるころ１３の直径よりも小さい。このため、ポケット２９にころ１３を組み入れる際に、ころ１３が脱落防止部３４を押すことによって、柱３３は、が弾性変形する。全てのころ１３を、外輪１２に位置させた保持器１４のポケット２９に組み入れたものが外輪アセンブリである。外輪アセンブリに、内輪１１を組み合わせたものが転がり軸受１０である。その組み入れの際、ころ１３の端面が第一凹面４４に沿って組み入れ治具を用いて押し込むことにより、ころ１３をポケット２９に円滑に組み入れることができる。 The method of assembling the rolling bearing 10 shown in FIG. 10 is as follows. With the retainer 14 positioned on the inner periphery of the outer ring 12, the rollers 13 are inserted into the pockets 29 of the retainer 14. The rollers 13 are inserted into the pockets 29 from the inner periphery of the retainer 14. As with the first embodiment (see FIG. 3), when focusing on one pocket 29, the dimension between the two anti-dropout portions 34 is smaller than the diameter of the rollers 13 at the positions where these anti-dropout portions 34 are formed. For this reason, when the rollers 13 are inserted into the pockets 29, the rollers 13 press the anti-dropout portions 34, causing the pillars 33 to elastically deform. The outer ring assembly is the assembly in which all the rollers 13 are inserted into the pockets 29 of the retainer 14 positioned on the outer ring 12. The outer ring assembly is combined with the inner ring 11 to form the rolling bearing 10. When installing the roller 13, the end face of the roller 13 is pushed along the first concave surface 44 using an installation jig, allowing the roller 13 to be smoothly installed into the pocket 29.
　図１１において、第一環状体３１と一つの柱３３とが接続される部分が第一接続部４１である。第二環状体３２と一つの柱３３とが接続される部分が第二接続部４２である。一つのポケット２９を構成する一つのポケット部１５に、第一接続部４１は二つ存在し、第二接続部４２は二つ存在する。この点についても、前記第一の形態（図２参照）と同じである。 In FIG. 11, the portion where the first annular body 31 and one of the pillars 33 are connected is the first connection portion 41. The portion where the second annular body 32 and one of the pillars 33 are connected is the second connection portion 42. In one pocket portion 15 that constitutes one pocket 29, there are two first connection portions 41 and two second connection portions 42. This is also the same as the first embodiment (see FIG. 2).
　第一接続部４１は、外周側に位置する凹円弧面４３と、内周側に位置するリセス面４４とを有する。凹円弧面４３は、微小半径の円柱に沿った形状を有する面である。リセス面４４は、凹円弧面４３よりも大きく凹んでいる面である。図１１に示す形態の場合、凹円弧面４３及びリセス面４４は、第二接続部４２に設けられていないが、第二接続部４２に設けられていてもよい。 The first connection portion 41 has a concave arc surface 43 located on the outer periphery side and a recessed surface 44 located on the inner periphery side. The concave arc surface 43 is a surface having a shape along a cylinder with a small radius. The recessed surface 44 is a surface that is more recessed than the concave arc surface 43. In the case of the form shown in FIG. 11, the concave arc surface 43 and the recessed surface 44 are not provided in the second connection portion 42, but may be provided in the second connection portion 42.
　リセス面４４は円すいに沿った形状を有する面である。リセス面４４は、凹円弧面４３から半径方向に離れるにしたがって、つまり、内周側に向かうにしたがって、凹みを大きくする傾斜面４５を有する。リセス面４４と、ころ１３（図１０参照）の端面２６との間に形成される隙間ｅ１は、傾斜面４５により、内周側に向かうにしたがって大きくなる。凹円弧面４３及びリセス面４４の形状は、前記第一の形態（図６及び図７）と同様である。 The recessed surface 44 is a surface having a shape that follows a cone. The recessed surface 44 has an inclined surface 45 that increases the concavity as it moves away from the concave arc surface 43 in the radial direction, that is, toward the inner periphery. The inclined surface 45 increases the gap e1 formed between the recessed surface 44 and the end face 26 of the roller 13 (see FIG. 10) toward the inner periphery. The shapes of the concave arc surface 43 and the recessed surface 44 are the same as those of the first embodiment (FIGS. 6 and 7).
　図１２は、図１１に示す保持器１４の変形例を示す斜視図である。図１２に示す保持器１４は、第一環状体３１が連結面４６を有する点で、図１１に示す保持器１４と異なる。図１２に示す保持器１４の場合、第一環状体３１は、周方向で隣り合う一対の柱３３のうち、一方の柱３３側のリセス面４４と他方の柱３３側のリセス面４４とを繋ぐ連結面４６を有する。連結面４６は、内周側に向かってころ１３（第一端面２６）との間に形成される隙間が徐々に大きくなる面である。連結面４６は、第一環状体３１の側面３１ａから傾斜する面である。連結面４６は、図８に示す保持器１４の連結面４６と同様の構成である。 12 is a perspective view showing a modified example of the retainer 14 shown in FIG. 11. The retainer 14 shown in FIG. 12 differs from the retainer 14 shown in FIG. 11 in that the first annular body 31 has a connecting surface 46. In the case of the retainer 14 shown in FIG. 12, the first annular body 31 has a connecting surface 46 that connects the recess surface 44 on one pillar 33 side and the recess surface 44 on the other pillar 33 side of a pair of pillars 33 adjacent to each other in the circumferential direction. The connecting surface 46 is a surface where the gap formed between the roller 13 (first end surface 26) gradually increases toward the inner circumferential side. The connecting surface 46 is a surface that is inclined from the side surface 31a of the first annular body 31. The connecting surface 46 has the same configuration as the connecting surface 46 of the retainer 14 shown in FIG. 8.
〔転がり軸受の第三の形態〕
　図１３は、転がり軸受の他の実施形態を示す断面図である。図１３に示す転がり軸受１０は、円すいころ軸受であり、内輪１１と外輪１２との間に設けられるころ１３が、円すいころである。図１３に示す転がり軸受１０に関して、図１に示す転がり軸受１０と同じ構成は、同じ符号を付しており、同じ構成の説明を省略する。第三の形態に係る転がり軸受１０が有する保持器１４は、図１４に示すように、複数の保持器セグメント１７により構成される。複数の保持器セグメント１７は、内輪１１と外輪１２との間の環状空間Ｓに位置する。一つの保持器セグメント１７に一つのころ１３が保持される。 [Third Form of Rolling Bearing]
Fig. 13 is a cross-sectional view showing another embodiment of a rolling bearing. The rolling bearing 10 shown in Fig. 13 is a tapered roller bearing, and the rollers 13 provided between the inner ring 11 and the outer ring 12 are tapered rollers. In the rolling bearing 10 shown in Fig. 13, the same components as those in the rolling bearing 10 shown in Fig. 1 are given the same reference numerals, and a description of the same components will be omitted. The cage 14 of the rolling bearing 10 according to the third embodiment is composed of a plurality of cage segments 17, as shown in Fig. 14. The plurality of cage segments 17 are located in the annular space S between the inner ring 11 and the outer ring 12. One roller 13 is held in one cage segment 17.
　図１５は、保持器セグメント１７の斜視図である。保持器セグメント１７は、第一壁５１と、第二壁５２と、２つの柱５３とを有する。第一壁５１は、ころ１３（図１３参照）の第一端面２６に対向する。第二壁５２は、ころ１３の第二端面２７に対向する。柱５３は、第一壁５１と第二壁５２とを繋ぐ。柱５３は、ころ１３の外周面２８に対向する。第一壁５１と第二壁５２との間であって一対の柱５３の間の空間が、ころ１３を収容するポケット２９となる。 Figure 15 is a perspective view of the retainer segment 17. The retainer segment 17 has a first wall 51, a second wall 52, and two pillars 53. The first wall 51 faces the first end face 26 of the roller 13 (see Figure 13). The second wall 52 faces the second end face 27 of the roller 13. The pillars 53 connect the first wall 51 and the second wall 52. The pillars 53 face the outer peripheral surface 28 of the roller 13. The space between the first wall 51 and the second wall 52 and between the pair of pillars 53 becomes the pocket 29 that accommodates the roller 13.
　柱５３は、保持器セグメント１７の外周側に、ポケット２９に収容するころ１３の脱落を防ぐ外側の脱落防止部３５を有する。脱落防止部３５は、柱５３から突出する突起により構成されている。ポケット２９に収容されたころ１３は、保持器１４の半径方向の外側に変位すると、脱落防止部３５に接触し、ころ１３の脱落が防止される。
　柱５３は、保持器セグメント１７の内周側に、ポケット２９に収容するころ１３の脱落を防ぐ内側の脱落防止部３４を有する。脱落防止部３４は、柱５３から突出する突起により構成されている。ポケット２９に収容されたころ１３は、保持器１４の半径方向の内側に変位すると、脱落防止部３４に接触し、ころ１３の脱落が防止される。 The pillars 53 have outer drop-out prevention portions 35 on the outer circumferential side of the cage segment 17, which prevent the rollers 13 housed in the pockets 29 from falling out. The drop-out prevention portions 35 are formed by protrusions that protrude from the pillars 53. When the rollers 13 housed in the pockets 29 are displaced radially outward of the cage 14, they come into contact with the drop-out prevention portions 35, preventing the rollers 13 from falling out.
The pillars 53 have inner drop prevention portions 34 on the inner peripheral side of the cage segment 17, which prevent the rollers 13 housed in the pockets 29 from falling out. The drop prevention portions 34 are formed by protrusions that protrude from the pillars 53. When the rollers 13 housed in the pockets 29 are displaced radially inward of the cage 14, they come into contact with the drop prevention portions 34, preventing the rollers 13 from falling out.
　図１３に示す転がり軸受１０の組み立て方法は次のとおりである。ころ１３は、保持器セグメント１７のポケット２９に組み入れられる。ころ１３は、保持器セグメント１７の外周側からポケット２９に組み入れられる。一つの保持器セグメント１７に着目すると（図１５参照）、２つの外側の脱落防止部３５の間の寸法は、これら脱落防止部３５の形成位置におけるころ１３の直径よりも小さい。このため、ポケット２９にころ１３を組み入れる際に、ころ１３が外側の脱落防止部３５を押すことによって、柱５３は、弾性変形する。全てのころ１３を保持器セグメント１７に組み入れたものが保持器付きころである。保持器付きころと、内輪１１とを組み合わせ、さらに外輪１２を組み合わせたものが転がり軸受１０である。 The rolling bearing 10 shown in FIG. 13 is assembled as follows. The rollers 13 are fitted into the pockets 29 of the retainer segments 17. The rollers 13 are fitted into the pockets 29 from the outer periphery of the retainer segment 17. Focusing on one retainer segment 17 (see FIG. 15), the dimension between the two outer anti-dropout portions 35 is smaller than the diameter of the rollers 13 at the positions where these anti-dropout portions 35 are formed. For this reason, when fitting the rollers 13 into the pockets 29, the rollers 13 press the outer anti-dropout portions 35, causing the pillars 53 to elastically deform. When all the rollers 13 are fitted into the retainer segment 17, it becomes a roller and retainer. When the roller and retainer are combined with the inner ring 11 and then with the outer ring 12, it becomes a rolling bearing 10.
　図１５において、第一壁５１と一つの柱５３とが接続される部分が第一接続部４１である。第二壁５２と一つの柱５３とが接続される部分が第二接続部４２である。第一接続部４１は、一つの保持器セグメント１７に二つ存在し、第二接続部４２は、一つの保持器セグメント１７に二つ存在する。 In FIG. 15, the portion where the first wall 51 and one of the pillars 53 are connected is the first connection portion 41. The portion where the second wall 52 and one of the pillars 53 are connected is the second connection portion 42. There are two first connection portions 41 in one retainer segment 17, and there are two second connection portions 42 in one retainer segment 17.
　第一接続部４１は、内周側に位置する凹円弧面４３と、外周側に位置するリセス面４４とを有する。凹円弧面４３は、微小半径の円柱に沿った形状を有する面である。リセス面４４は、凹円弧面４３よりも大きく凹んでいる面である。凹円弧面４３及びリセス面４４は、第二接続部４２にも設けられている。つまり、第二接続部４２は、内周側に位置する凹円弧面４３と、外周側に位置するリセス面４４とを有する。第一接続部４１の凹円弧面４３と第二接続部４２の凹円弧面４３とは同じ形状であり、第一接続部４１のリセス面４４と第二接続部４２のリセス面４４とは同じ形状である。 The first connection portion 41 has a concave arc surface 43 located on the inner circumference side and a recessed surface 44 located on the outer circumference side. The concave arc surface 43 is a surface having a shape along a cylinder with a small radius. The recessed surface 44 is a surface that is more recessed than the concave arc surface 43. The concave arc surface 43 and the recessed surface 44 are also provided on the second connection portion 42. In other words, the second connection portion 42 has a concave arc surface 43 located on the inner circumference side and a recessed surface 44 located on the outer circumference side. The concave arc surface 43 of the first connection portion 41 and the concave arc surface 43 of the second connection portion 42 have the same shape, and the recessed surface 44 of the first connection portion 41 and the recessed surface 44 of the second connection portion 42 have the same shape.
　リセス面４４は円すいに沿った形状を有する面である。リセス面４４は、凹円弧面４３から半径方向に離れるにしたがって、つまり、外周側に向かうにしたがって、凹みを大きくする傾斜面４５を有する。リセス面４４と、ころ１３（図１３参照）の端面２６（２７）との間に形成される隙間が、傾斜面４５により、外周側に向かうにしたがって大きくなる。凹円弧面４３及びリセス面４４の形状は、前記第一の形態（図６及び図７）と同様である。 The recessed surface 44 is a surface shaped like a cone. The recessed surface 44 has an inclined surface 45 that increases the recession as it moves away from the concave arc surface 43 in the radial direction, that is, toward the outer periphery. The inclined surface 45 increases the gap formed between the recessed surface 44 and the end surface 26 (27) of the roller 13 (see FIG. 13) toward the outer periphery. The shapes of the concave arc surface 43 and the recessed surface 44 are the same as those of the first embodiment (FIGS. 6 and 7).
〔各形態の転がり軸受１０及び保持器１４について〕
　以上のように、前記各形態の転がり軸受１０が有する保持器１４は、ころ１３の第一端面２６に対向する第一環状体３１（第一壁５１）と、ころ１３の第二端面２７に対向する第二環状体３２（第二壁５２）と、第一環状体３１（第一壁５１）と第二環状体３２（第二壁５２）とを繋ぐ複数の柱３３（柱５３）とを有する。第一環状体３１（第一壁５１）と第二環状体３２（第二壁５２）との間であって一対の柱３３（柱５３）の間の空間が、ころ１３を収容するポケット２９となる。 [Regarding each embodiment of the rolling bearing 10 and the cage 14]
As described above, the cage 14 of the rolling bearing 10 in each of the above embodiments has the first annular body 31 (first wall 51) facing the first end face 26 of the roller 13, the second annular body 32 (second wall 52) facing the second end face 27 of the roller 13, and a plurality of pillars 33 (pillars 53) connecting the first annular body 31 (first wall 51) and the second annular body 32 (second wall 52). The space between the first annular body 31 (first wall 51) and the second annular body 32 (second wall 52) and between the pair of pillars 33 (pillars 53) forms the pocket 29 that accommodates the rollers 13.
　柱３３（柱５３）は、半径方向の第一側に、ポケット２９に収容するころ１３の脱落を防ぐ脱落防止部を有する。
　前記第一の形態の保持器１４の場合（図３及び図４参照）、及び、前記第二の形態の保持器１４の場合（図１１参照）、半径方向の第一側が、保持器１４の内周側であり、半径方向の第二側が、保持器１４の外周側である。
　前記第三の形態の保持器１４（保持器セグメント１７）の場合（図１５参照）、半径方向の第一側が、保持器１４（保持器セグメント１７）の外周側であり、半径方向の第二側が、保持器１４（保持器セグメント１７）の内周側である。 The pillar 33 (pillar 53) has a fall-out prevention portion on a first radial side that prevents the roller 13 housed in the pocket 29 from falling out.
In the case of the first form of retainer 14 (see Figures 3 and 4) and in the case of the second form of retainer 14 (see Figure 11), the first radial side is the inner side of the retainer 14, and the second radial side is the outer side of the retainer 14.
In the case of the third form of retainer 14 (retainer segment 17) (see Figure 15), the first radial side is the outer circumferential side of the retainer 14 (retainer segment 17), and the second radial side is the inner circumferential side of the retainer 14 (retainer segment 17).
　前記各形態の保持器１４において、第一環状体３１（第一壁５１）と柱３３（柱５３）との第一接続部４１は、半径方向の第二側に位置する凹円弧面４３と、半径方向の第一側に位置するリセス面４４とを有する。リセス面４４は、凹円弧面よりも大きく凹んでいる。
　前記各形態の保持器１４を有する転がり軸受１０の組み立て方法は、ポケット２９に対してころ１３を半径方向の第一側から組み入れて、保持器１４ところ１３とのユニットを得る一体化工程を有する。その一体化工程において、ころ１３は、脱落防止部を押して柱３３（柱５３）を弾性変形させ、ころ１３は、ポケット２９に組み入れられる。 In each of the above-described embodiments of the cage 14, the first connection portion 41 between the first annular body 31 (first wall 51) and the pillar 33 (pillar 53) has a concave arc surface 43 located on the second radial side and a recess surface 44 located on the first radial side. The recess surface 44 is recessed more than the concave arc surface.
The method of assembling the rolling bearing 10 having the cage 14 of each of the above embodiments includes an integration step of fitting the rollers 13 into the pockets 29 from the first radial side to obtain a unit with the cage 14 and the rollers 13. In the integration step, the rollers 13 push the anti-fall-out portions to elastically deform the pillars 33 (pillars 53), and the rollers 13 are fitted into the pockets 29.
　ポケット２９にころ１３を組み入れるために、柱３３（柱５３）は、弾性変形する。この場合であっても、保持器１４は、第一接続部４１に生じる応力集中を、リセス面４４によって緩和することが可能となる。
　リセス面４４は、半径方向の第一側に存在するが、半径方向の第二側に存在しない。このため、ころ１３の第一端面２６と第一環状体３１（第一壁５１）との接触面積は、従来よりも広く確保される。前記接触面積の縮小による保持器１４の摩耗が抑えられる。 The pillars 33 (pillars 53) are elastically deformed in order to fit the rollers 13 into the pockets 29. Even in this case, the retainer 14 can alleviate the stress concentration occurring in the first connection portions 41 by the recessed surfaces 44.
The recessed surface 44 is present on the first radial side but not on the second radial side. This ensures a larger contact area between the first end face 26 of the roller 13 and the first annular body 31 (first wall 51) than in the past. The reduction in the contact area reduces wear on the cage 14.
　リセス面４４は、半径方向の第一側に存在するが、半径方向の第二側に存在しない。このため、保持器１４の強度低下が抑制される。
　前記各形態の保持器１４は、リセス面４４により、柱３３（柱５３）における弾性変形部の長さが大きくなり、ころ１３をポケット２９へ組み込みやすくなる。 The recessed surface 44 is present on the first radial side but is not present on the second radial side, thereby preventing a decrease in the strength of the cage 14.
In each of the above-described embodiments of the cage 14 , the recessed surface 44 increases the length of the elastically deformable portion of the pillar 33 (pillar 53 ), making it easier to fit the rollers 13 into the pockets 29 .
　前記第一の形態及び前記第三の形態において、第二環状体３２（第二壁５２）と柱３３（柱５３）との第二接続部４２は、第一接続部４１と同様、半径方向の第二側に位置する凹円弧面４３と、半径方向の第一側に位置するリセス面４４とを有する。リセス面４４は、凹円弧面４３よりも大きく凹んでいる。このため、ころ１３の第二端面２７と第二環状体３２（第二壁５２）との接触面積は、従来よりも広く確保される。 In the first and third embodiments, the second connection portion 42 between the second annular body 32 (second wall 52) and the pillar 33 (pillar 53) has a concave arc surface 43 located on the second radial side and a recessed surface 44 located on the first radial side, similar to the first connection portion 41. The recessed surface 44 is more recessed than the concave arc surface 43. Therefore, the contact area between the second end surface 27 of the roller 13 and the second annular body 32 (second wall 52) is ensured to be larger than in the past.
　前記各形態の場合、リセス面４４は、凹円弧面４３から半径方向に離れるにしたがって、ころ１３との間に形成される隙間が大きくなる傾斜面４５を有する。ころ１３の第一端面２６と第一環状体３１（第一壁５１）との接触面積は、この傾斜面４５により、応力集中の緩和機能を損なうことなく、前記接触面積を広く確保することができる。 In each of the above embodiments, the recess surface 44 has an inclined surface 45 that increases the gap between the roller 13 and the recessed surface 44 as it moves away from the concave arc surface 43 in the radial direction. This inclined surface 45 ensures a wide contact area between the first end surface 26 of the roller 13 and the first annular body 31 (first wall 51) without impairing the stress concentration relief function.
〔その他について〕
　前記各形態において、凹円弧面（第二凹面）４３と繋がるリセス面（第一凹面）４４は、円すいに沿った形状を有する場合について説明した。しかし、リセス面４４は、それ以外であってもよく、図示しないが、凹円弧面４３よりも大きな円柱に沿った形状の面を有していてもよい。例えばリセス面４４は、凹円弧面４３よりも大きな円柱に沿った形状の面と、円すいに沿った形状の面とにより構成されていてもよい。 [Other matters]
In each of the above embodiments, the recessed surface (first concave surface) 44 connected to the concave arc surface (second concave surface) 43 has a shape along a cone. However, the recessed surface 44 may have a shape other than that, and may have a surface shaped along a cylinder larger than the concave arc surface 43, although this is not shown. For example, the recessed surface 44 may be composed of a surface shaped along a cylinder larger than the concave arc surface 43 and a surface shaped along a cone.
　前記各形態において、凹円弧面４３とリセス面４４との境界は、第一接続部４１（第二接続部４２）の径方向の途中位置にある。凹円弧面４３の方がリセス面４４よりも半径方向に長い範囲に形成されていてもよく、リセス面４４の方が凹円弧面４３よりも半径方向に長い範囲に形成されていてもよい。凹円弧面４３の方が長い範囲に形成される場合、前記接触面積はより広くなる。リセス面４４の方が長い範囲に形成される場合、応力集中の緩和機能は高くなる。 In each of the above embodiments, the boundary between the concave arc surface 43 and the recessed surface 44 is located midway in the radial direction of the first connection portion 41 (second connection portion 42). The concave arc surface 43 may be formed over a longer radial range than the recessed surface 44, or the recessed surface 44 may be formed over a longer radial range than the concave arc surface 43. When the concave arc surface 43 is formed over a longer range, the contact area becomes larger. When the recessed surface 44 is formed over a longer range, the stress concentration relief function becomes higher.
　前記各形態について説明したように、保持器の形状は、転がり軸受の形態に応じて、つまり、転がり軸受が有する転動体によって異なっていてもよい。 As explained for each of the above embodiments, the shape of the cage may vary depending on the type of rolling bearing, i.e., the rolling elements that the rolling bearing has.
　前記実施形態は、すべての点で例示であって制限的なものではない。本発明の権利範囲は、前記実施形態ではなく請求の範囲によって示され、請求の範囲に記載された構成と均等の範囲内でのすべての変更を含む。 The above-described embodiments are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims, not by the above-described embodiments, and includes all modifications within the scope of equivalence to the configurations described in the claims.
　１０　転がり軸受
　１１　内輪
　１２　外輪
　１３　ころ
　１４　保持器
　１７　保持器セグメント
　２６　第一端面
　２７　第二端面
　２９　ポケット
　３１　第一環状体（第一壁）
　３２　第二環状体（第二壁）
　３３　柱
　３４　脱落防止部
　３５　脱落防止部
　４１　第一接続部（接続部）
　４２　第二接続部
　４３　凹円弧面（第二凹面）
　４４　リセス面（第一凹面）
　４５　傾斜面
　４６　連結面
　５１　第一壁
　５２　第二壁
　５３　柱 REFERENCE SIGNS LIST 10 Rolling bearing 11 Inner ring 12 Outer ring 13 Roller 14 Cage 17 Cage segment 26 First end face 27 Second end face 29 Pocket 31 First annular body (first wall)
32 Second annular body (second wall)
33 Pillar 34 Fall-off prevention part 35 Fall-off prevention part 41 First connection part (connection part)
42 Second connection portion 43 Concave arc surface (second concave surface)
44 Recess surface (first concave surface)
45 Inclined surface 46 Connecting surface 51 First wall 52 Second wall 53 Pillar

Claims (7)

  1. 　転がり軸受のころの第一端面に対向する第一壁と、前記ころの第二端面に対向する第二壁と、前記第一壁と前記第二壁とを繋ぐ複数の柱と、を有し、前記第一壁と前記第二壁との間であって一対の前記柱の間の空間が、前記ころを収容するポケットとなる保持器であって、
    　前記柱は、半径方向の第一側及び第二側の少なくとも一方に、前記ポケットに収容する前記ころの脱落を防ぐ脱落防止部を有し、
    　前記第一壁と前記柱との接続部は、半径方向の第一側に位置する第一凹面と、半径方向の第二側に位置する第二凹面と、を有し、前記第一凹面は、前記第二凹面よりも大きく凹んでいる、保持器。     A cage having a first wall facing a first end surface of a roller of a rolling bearing, a second wall facing a second end surface of the roller, and a plurality of pillars connecting the first wall and the second wall, wherein a space between the pair of pillars between the first wall and the second wall forms a pocket for accommodating the roller,
    the pillar has a drop-out prevention portion on at least one of a first side and a second side in a radial direction to prevent the roller housed in the pocket from dropping out,
    A retainer, wherein a connection portion between the first wall and the pillar has a first concave surface located on a first radial side and a second concave surface located on a second radial side, the first concave surface being recessed more than the second concave surface.
  2. 　前記第一凹面は、前記第二凹面から半径方向に離れるにしたがって、前記ころとの間に形成される隙間が大きくなる傾斜面を有する、請求項１に記載の保持器。 The cage according to claim 1, wherein the first concave surface has an inclined surface such that the gap formed between the rollers increases as the first concave surface moves away from the second concave surface in the radial direction.
  3. 　樹脂製の保持器であって、
    　前記第一壁は、隣り合う一対の前記柱のうち、一方の前記柱側の前記第一凹面と、他方の前記柱側の前記第一凹面とを繋ぐ連結面を有し、
    　前記連結面は、半径方向の第一側に向かって前記ころとの間に形成される隙間が徐々に大きくなる面である、請求項２に記載の保持器。     A resin cage,
    The first wall has a connecting surface that connects the first concave surface on one of the pair of adjacent columns to the first concave surface on the other column,
    The cage according to claim 2 , wherein the connecting surface is a surface in which a gap formed between the connecting surface and the rollers gradually increases toward a first side in the radial direction.
  4. 　前記第一壁は、円環状である第一環状体であり、
    　前記第二壁は、円環状である第二環状体である、請求項１から請求項３のいずれか一項に記載の保持器。     the first wall is a first annular body having a circular ring shape;
    The cage according to claim 1 , wherein the second wall is a second annular body having a circular ring shape.
  5. 　転がり軸受が有する内輪と外輪との間の環状空間に位置する複数の保持器セグメントにより構成される保持器であって、
    　前記保持器セグメントそれぞれが、前記第一壁と、前記第二壁と、２つの前記柱と、を有する、請求項１から請求項３のいずれか一項に記載の保持器。     A cage including a plurality of cage segments disposed in an annular space between an inner ring and an outer ring of a rolling bearing,
    The retainer of claim 1 , wherein each of the retainer segments has the first wall, the second wall, and two of the posts.
  6. 　内輪と、外輪と、前記内輪と前記外輪との間に位置する複数のころと、前記ころを保持する保持器と、を備え、
    　前記保持器は、請求項１から請求項５のいずれか一項に記載の保持器である、
    　転がり軸受。     The bearing comprises an inner ring, an outer ring, a plurality of rollers positioned between the inner ring and the outer ring, and a cage that holds the rollers,
    The cage is a cage according to any one of claims 1 to 5.
    Rolling bearing.
  7. 　請求項６に記載の転がり軸受の組み立て方法であって、
    　前記ポケットに対して前記ころを半径方向の第一側及び第二側の少なくとも一方から組み入れて前記保持器と前記ころとのユニットを得る一体化工程を有し、
    　前記一体化工程で、前記ころが前記脱落防止部を押して前記柱を弾性変形させながら、前記ころが前記ポケットに組み入れられる、
    　転がり軸受の組み立て方法。
          A method for assembling a rolling bearing according to claim 6, comprising the steps of:
    an integration step of assembling the rollers into the pockets from at least one of a first side and a second side in a radial direction to obtain a unit of the cage and the rollers,
    In the integration process, the roller is inserted into the pocket while pressing the fall-off prevention portion to elastically deform the pillar.
    How to assemble rolling bearings.
PCT/JP2022/036956 2022-10-03 2022-10-03 Retainer, roller bearing, and method for assembling rolling bearing WO2024075156A1 (en)

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PCT/JP2022/036956 WO2024075156A1 (en) 2022-10-03 2022-10-03 Retainer, roller bearing, and method for assembling rolling bearing
PCT/JP2022/045728 WO2024075316A1 (en) 2022-10-03 2022-12-12 Cage, rolling bearing, and method for assembling rolling bearing

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002235752A (en) * 2001-02-07 2002-08-23 Nsk Ltd Cage for roller bearing
JP2002242938A (en) * 2001-02-16 2002-08-28 Nsk Ltd Cage for roller bearing
JP2013190006A (en) * 2012-03-13 2013-09-26 Ntn Corp Retainer for roller bearing
JP2015152045A (en) * 2014-02-12 2015-08-24 株式会社ジェイテクト Split holder for roller bearing, and roller bearing
JP2019143796A (en) * 2018-02-21 2019-08-29 Ntn株式会社 Cage for conical roller bearing, and conical roller bearing
JP2019173781A (en) * 2018-03-27 2019-10-10 株式会社ジェイテクト Cage-and-roller

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002235752A (en) * 2001-02-07 2002-08-23 Nsk Ltd Cage for roller bearing
JP2002242938A (en) * 2001-02-16 2002-08-28 Nsk Ltd Cage for roller bearing
JP2013190006A (en) * 2012-03-13 2013-09-26 Ntn Corp Retainer for roller bearing
JP2015152045A (en) * 2014-02-12 2015-08-24 株式会社ジェイテクト Split holder for roller bearing, and roller bearing
JP2019143796A (en) * 2018-02-21 2019-08-29 Ntn株式会社 Cage for conical roller bearing, and conical roller bearing
JP2019173781A (en) * 2018-03-27 2019-10-10 株式会社ジェイテクト Cage-and-roller

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